Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Finland - Zeppelin Flight - 1933 (October 14-17), Chicago (Century of Progress) Flight registered postcard to Brazil, franked by 25m dark brown, tied by Helsinki ''6.X.33'' marking, Berlin-Friedrichshafen connection and triangle flight cachet, Pernambuco ''17.X.33'' receiver on the back, VF, Sieger #238, C.v. €500, Est. $300-$350, Scott #179